assume cs:code,ds:data
data segment
	db 'conversation'
data ends
code segment
start:	mov ax,data
	mov ds,ax
	mov si,0		;ds:si 指向字符串所在空间的首地址
	mov cx,12		;cx 存放字符串的长度
	call capital
	mov ax,4c00h
	int 21h
	
capital:	and byte ptr [si],11011111b
	inc si
	loop capital
	ret
code ends
end start